Soot blower



Jan. 3; 1939. I H. E BRELSFQRD ET AL 2,142,778-

sooT BLOWER Original Filed Sept, l0, 1952 ATTORNEY Patented Jan. 3, 1939PATENT OFFICE SOOT BLOWER 4Harry E. Brelsford, Birmingham, and Curtis L.

Howse and Frank Bowers, Detroit, Mich., as-

signors to Diamond Power Specialty Corporation, Detroit, Mich., acorporation of Michigan Original application September 19, 1932, SerialNo. 632,614. Divided and this application September 10, 1934, Serial No.743,398. Renewed December 30, 1937 1 Claim.

This invention is directed to means for cleaning boilers or other heatexchange apparatus and contemplates the provision of means fordischarging adjacent the heating surfaces thereof, jets of cleaningfluid to dislodge from said surfaces deposits Which may be formedthereon.

This application is a division of our co-pending application, SerialNumber 632,614, iiled September l0, 1932.

The numerous objects and advantages or the invention will becomeapparent as the following description proceeds particularly Whenreference is had to the accompanying drawing wherein like referencecharacters designate corresponding parts throughout all views andwherein Fig. l is a plan view of one form in which our invention may beembodied;

Fig. 2 is a sectional View taken substantialll7 on the line 2-2 of Fig.1;

Fig. 3 is a sectional View taken substantially on the line 3-3 of Fig.l;

Fig. 4 is a section through the pilot valve controlling the pistonsactuating the element and valve;

Fig. 5 is a detail view of the piston ring used in the piston shown inFig. 2.

Referring now to Figures 1 to 5 inclusive, When air is admitted by asuitable controller adapted to supply air in puffs through linel |02 ontop of the piston |32, this is depressed lcarrying with it the paWl |33which acts against the spring |44 to rotate the gear |45. Gear |45 isfixed to a suitable blower element 91 adapted to discharge cleaningfluid adjacent portions of the fluid heater or the like to be cleaned.

In the line |02 leading from the controller is provided a T |46 fromwhich leads line |41 to the pilot valve |48. At the same time that airis admitted on top of piston |32 it enters the pilot valve |48 throughline |41, acting on the face of piston |49. This is connected throughrod |56 to valve |5| so that when the piston |49 is moved to the rightin Figure 4 it moves the valve l5| from its seat against the action ofthe spring |53.

The control valve |58 normally rests against its seat |59. The valve |58is attached through rod |34 to piston |69 mounted in piston housing |66.Cleaning uid from the supply line 6l entering the operating head throughopening |36 acts both on the top of the valve |53 and on the face o1"the piston |60. Piston ring |35 is provided in piston |60, the pistonring being provided With a graduated opening |35 (shown in Figure 5)admitting the cleaning uid to the space |31 in the piston housing |68.Thus, under normal conditions the same pressure is established on eachside of the piston |60, the valve being kept closed by the action ofspring |69.

Upon venting of the pressure in the space |31 above the piston it isobvious that the pressure of the cleaning fluid acting on the face |38of piston |60 will move the piston against spring |69, to open thevalve.

It is the function of the pilot valve |48 hereinbefore described toprovide a vent for the pressure in the space |31 permitting the valve toopen.

As hereinbefore described, when the iiuid pressure is admitted to thepilot valve |48, it moves the valve |5| from its seat |52 so that thepressure from the space |31 in the piston housing |68 passes throughline |54, through valve |5| on top of the valve |1|.

Referring now to Figure 3, it Will be noted that the lever |55 ispivotally supported on the lug |56, this lever being adapted to engagethe cam |51 xedly mounted on gear |45. Cam |51 is made of the desiredlength in order to x the period of opening of the supply valve |58.Thus, the length of the cam determines the fraction of rotative movementof the element 91 over which the control valve |58 is open.

When the lever |55 is engaged by the cam |51 it raises the stem |10upwardly, moving the valve |1| away from its seat |12. When the valve|1| is -moved from its seat |12, iiuid pressure, admitted to the pilotvalve |48 from the space |31 in the piston housing |68, passes toexhaust through openings |39.

It will thus be seen that when the controller admits the cleaning uid toline |02 through T |46 and line |41 to pilot valve |48, that the resultis to vent the pressure from space |31 only when the lever |55 hasengaged the cam |51 so that both of the valves in the pilot valve areopen.

I f this trigger |55 does not engage the cam |51 the pilot valve |48will not be fully open to exhaust and, consequently, the supply valve|56 will not open.

It will be noted from Figure 2 that the amount of movement of the piston|60 is determined by the abutting of the skirt of the piston against theshoulder |61. This movement is suicient to Withdraw the valve |58entirely Within the piston housing |68, thus providing a relativelyunobstructed passage for the cleaning fluid from line 8| to element 91,affording a construction giving the minimum pressure drop through theoperating head.

Thus, in the operating head, as shown in Fgure 3, the gear may beprovided with eighty teeth. The pawl |33 may be adapted to actuate gear|45 the distance of four teeth at each power impulse, thus requiring atotal of 20 impulses to rotate the nozzled tube 9T through exactly 36 Toaccomplish this result with the second type of controller described, theextent of the arcuate port 234 may be made with such relation to gear245 as to insure that the gear 245 is rncved a distance of twenty teethby the pawl 2553 while the arcuate port 234 in the rotatable valvemember 233 is in registry with one of the hoies 235 in the stationaryValve plate 235. It has been found in practice that such a proportioningof the parts aiords a very satisfactory operation but it should bepointed out that these proportions may be varied to secure any desiredactuation of the boiler cleaner operating head. With the construction ofthe second controller it is convenient to Limit this amount of arcuateactuation to one complete revolution or less, whereas in the controllerof the first type described, arcuate travel may very conveniently bethree complete rotations or any fraction thereof. It is obvious that theproportions of the parts might be varied in both instances to secure anydesired results.

While one form of the invention has been described in some detail, it isto be clearly understood that the description is for the purposes ofillustration only and is not denitive of the limits of the inventiveidea. The right is reserved to make such changes in the details oiconstruction and arrangement of parts as will fall within the purview ofthe attached claim.

What we claim as our invention is:

In a uid heater cleaner, a rotatable blower element, a source ofcleaning uid under pressure, a cleaning uid supply pipe connecting thesource of cleaning uid to the blower element, a Valve in said supplypipe controlling the flow of cleaning uid from said source to saidblower element, a piston connected to said valve for actuating the same,a cylinder in which said piston is mounted, said cylinder being soassociated with said supply pipe that one side of the piston in thecylinder is exposed to the pressure of the cleaning fluid in the supplypipe, means including a second piston adjacent said blower element formoving the same, a cylinder in which said second piston is mounted,means for intermittently supplying cleaning uid from said source to saidlast mentioned cylinder to effect a reciprocation of the piston thereinand a step by step movement of said blower element, a plunger exposed tothe pressure of the cleaning uid acting on said second mentioned piston,said plunger thus being adapted to reciprocate in unison with saidsecond mentioned piston, a valve connected to said plunger forcontrolling the exhaust of pressure on one side of said first mentionedpiston whereby the cleaning fluid acting on the other side of said rstmentioned piston may move the same to open said Valve, and a secondvalve so controlled by the rotation of said blower element for.controlling the effective operation of said plunger actuated valve,that said main cleaning iluid controlled valve is periodically openedand closed during a predetermined portion of the rotation of the blowerelement.

HARRY E. BRELSFCRD. CURTIS L. HOWSE. FRANK BOVERS.

